3921689898 has 48 divisors (see below), whose sum is σ = 9962940480. Its totient is φ = 1120134960.

The previous prime is 3921689881. The next prime is 3921689929. The reversal of 3921689898 is 8989861293.

3921689898 is a `hidden beast` number, since 392 + 168 + 9 + 89 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1215928 + ... + 1219148.

It is an arithmetic number, because the mean of its divisors is an integer number (207561260).

Almost surely, 2^3921689898 is an apocalyptic number.

3921689898 is an abundant number, since it is smaller than the sum of its proper divisors (6041250582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3921689898 is an frugal number, since it uses more digits than its factorization.

3921689898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460 (or 3233 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The square root of 3921689898 is about 62623.3973687152. The cubic root of 3921689898 is about 1576.9735767416.

The spelling of 3921689898 in words is "three billion, nine hundred twenty-one million, six hundred eighty-nine thousand, eight hundred ninety-eight".